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281 lines
12 KiB
281 lines
12 KiB
// plasmaDHTChunk.java
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// ------------------------------
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// part of YaCy
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2006
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// created: 18.02.2006
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.Iterator;
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import de.anomic.kelondro.kelondroBase64Order;
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import de.anomic.kelondro.kelondroException;
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import de.anomic.server.serverCodings;
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import de.anomic.server.logging.serverLog;
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import de.anomic.yacy.yacyCore;
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import de.anomic.yacy.yacyDHTAction;
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import de.anomic.yacy.yacySeedDB;
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public class plasmaDHTChunk {
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public static final int chunkStatus_UNDEFINED = -1;
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public static final int chunkStatus_FAILED = 0;
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public static final int chunkStatus_FILLED = 1;
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public static final int chunkStatus_RUNNING = 2;
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public static final int chunkStatus_INTERRUPTED = 3;
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public static final int chunkStatus_COMPLETE = 4;
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public static final int peerRedundancy = 3;
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private plasmaWordIndex wordIndex;
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private serverLog log;
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private plasmaCrawlLURL lurls;
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private int status = chunkStatus_UNDEFINED;
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private String startPointHash;
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private plasmaWordIndexEntryContainer[] indexContainers = null;
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private HashMap urlCache; // String (url-hash) / plasmaCrawlLURL.Entry
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private int idxCount;
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public plasmaWordIndexEntryContainer firstContainer() {
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return indexContainers[0];
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}
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public plasmaWordIndexEntryContainer lastContainer() {
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return indexContainers[indexContainers.length - 1];
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}
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public plasmaWordIndexEntryContainer[] containers() {
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return indexContainers;
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}
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public int containerSize() {
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return indexContainers.length;
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}
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public int indexCount() {
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return this.idxCount;
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}
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private int indexCounter() {
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int c = 0;
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for (int i = 0; i < indexContainers.length; i++) {
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c += indexContainers[i].size();
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}
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return c;
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}
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public HashMap urlCacheMap() {
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return urlCache;
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}
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public void setStatus(int newStatus) {
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this.status = newStatus;
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}
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public int getStatus() {
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return this.status;
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}
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public plasmaDHTChunk(serverLog log, plasmaWordIndex wordIndex, plasmaCrawlLURL lurls, int minCount, int maxCount) {
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this.log = log;
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this.wordIndex = wordIndex;
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this.lurls = lurls;
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startPointHash = selectTransferStart();
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log.logFine("Selected hash " + startPointHash + " as start point for index distribution, distance = " + yacyDHTAction.dhtDistance(yacyCore.seedDB.mySeed.hash, startPointHash));
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selectTransferContainers(startPointHash, minCount, maxCount);
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// count the indexes, can be smaller as expected
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this.idxCount = indexCounter();
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if (idxCount < minCount) {
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log.logFine("Too few (" + idxCount + ") indexes selected for transfer.");
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this.status = chunkStatus_FAILED;
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}
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}
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public plasmaDHTChunk(serverLog log, plasmaWordIndex wordIndex, plasmaCrawlLURL lurls, int minCount, int maxCount, String startHash) {
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this.log = log;
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this.wordIndex = wordIndex;
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this.lurls = lurls;
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log.logFine("Demanded hash " + startHash + " as start point for index distribution, distance = " + yacyDHTAction.dhtDistance(yacyCore.seedDB.mySeed.hash, startPointHash));
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selectTransferContainers(startHash, minCount, maxCount);
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// count the indexes, can be smaller as expected
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this.idxCount = indexCounter();
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if (idxCount < minCount) {
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log.logFine("Too few (" + idxCount + ") indexes selected for transfer.");
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this.status = chunkStatus_FAILED;
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}
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}
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private String selectTransferStart() {
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String startPointHash;
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// first try to select with increasing probality a good start point
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double minimumDistance = ((double) peerRedundancy) / ((double) yacyCore.seedDB.sizeConnected());
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if (Math.round(Math.random() * 6) != 4)
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for (int i = 9; i > 0; i--) {
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startPointHash = kelondroBase64Order.enhancedCoder.encode(serverCodings.encodeMD5Raw(Long.toString(i + System.currentTimeMillis()))).substring(2, 2 + yacySeedDB.commonHashLength);
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if (yacyDHTAction.dhtDistance(yacyCore.seedDB.mySeed.hash, startPointHash) > (minimumDistance + ((double) i / (double) 10)))
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return startPointHash;
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}
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// if that fails, take simply the best start point (this is usually avoided, since that leads to always the same target peers)
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startPointHash = yacyCore.seedDB.mySeed.hash.substring(0, 11) + "z";
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return startPointHash;
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}
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private void selectTransferContainers(String hash, int mincount, int maxcount) {
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int refcountRAM = selectTransferContainersResource(hash, plasmaWordIndex.RL_RAMCACHE, maxcount);
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if (refcountRAM >= mincount) {
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log.logFine("DHT selection from RAM: " + refcountRAM + " entries");
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return;
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}
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int refcountFile = selectTransferContainersResource(hash, plasmaWordIndex.RL_WORDFILES, maxcount);
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log.logFine("DHT selection from FILE: " + refcountFile + " entries, RAM provided only " + refcountRAM + " entries");
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return;
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}
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private int selectTransferContainersResource(String hash, int resourceLevel, int maxcount) {
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// the hash is a start hash from where the indexes are picked
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ArrayList tmpContainers = new ArrayList(maxcount);
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String nexthash = "";
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try {
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Iterator wordHashIterator = wordIndex.wordHashSet(hash, resourceLevel, true, maxcount).iterator();
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plasmaWordIndexEntryContainer indexContainer;
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Iterator urlIter;
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plasmaWordIndexEntry indexEntry;
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plasmaCrawlLURL.Entry lurl;
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int refcount = 0;
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urlCache = new HashMap();
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double maximumDistance = ((double) peerRedundancy * 2) / ((double) yacyCore.seedDB.sizeConnected());
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while ((maxcount > refcount) && (wordHashIterator.hasNext()) && ((nexthash = (String) wordHashIterator.next()) != null) && (nexthash.trim().length() > 0)
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&& ((tmpContainers.size() == 0) || (yacyDHTAction.dhtDistance(nexthash, ((plasmaWordIndexEntryContainer) tmpContainers.get(0)).wordHash()) < maximumDistance))) {
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// make an on-the-fly entity and insert values
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indexContainer = wordIndex.getContainer(nexthash, true, 10000);
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int notBoundCounter = 0;
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try {
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urlIter = indexContainer.entries();
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// iterate over indexes to fetch url entries and store them in the urlCache
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while ((urlIter.hasNext()) && (maxcount > refcount)) {
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indexEntry = (plasmaWordIndexEntry) urlIter.next();
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try {
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lurl = lurls.getEntry(indexEntry.getUrlHash(), indexEntry);
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if ((lurl == null) || (lurl.url() == null)) {
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notBoundCounter++;
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urlIter.remove();
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wordIndex.removeEntries(nexthash, new String[] { indexEntry.getUrlHash() }, true);
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} else {
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urlCache.put(indexEntry.getUrlHash(), lurl);
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refcount++;
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}
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} catch (IOException e) {
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notBoundCounter++;
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urlIter.remove();
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wordIndex.removeEntries(nexthash, new String[] { indexEntry.getUrlHash() }, true);
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}
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}
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// remove all remaining; we have enough
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while (urlIter.hasNext()) {
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indexEntry = (plasmaWordIndexEntry) urlIter.next();
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urlIter.remove();
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}
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// use whats left
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log.logFine("Selected partial index (" + indexContainer.size() + " from " + wordIndex.indexSize(nexthash) + " URLs, " + notBoundCounter + " not bound) for word " + indexContainer.wordHash());
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tmpContainers.add(indexContainer);
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} catch (kelondroException e) {
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log.logSevere("plasmaWordIndexDistribution/2: deleted DB for word " + nexthash, e);
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wordIndex.deleteIndex(nexthash);
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}
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}
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// create result
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indexContainers = (plasmaWordIndexEntryContainer[]) tmpContainers.toArray(new plasmaWordIndexEntryContainer[tmpContainers.size()]);
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if ((indexContainers == null) || (indexContainers.length == 0)) {
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log.logFine("No index available for index transfer, hash start-point " + startPointHash);
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this.status = chunkStatus_FAILED;
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return 0;
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}
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this.status = chunkStatus_FILLED;
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return refcount;
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} catch (kelondroException e) {
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log.logSevere("selectTransferIndexes database corrupted: " + e.getMessage(), e);
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indexContainers = new plasmaWordIndexEntryContainer[0];
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urlCache = new HashMap();
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this.status = chunkStatus_FAILED;
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return 0;
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} catch (IOException e) {
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log.logSevere("selectTransferIndexes database corrupted: " + e.getMessage(), e);
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indexContainers = new plasmaWordIndexEntryContainer[0];
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urlCache = new HashMap();
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this.status = chunkStatus_FAILED;
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return 0;
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}
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}
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public int deleteTransferIndexes() {
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Iterator urlIter;
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plasmaWordIndexEntry indexEntry;
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String[] urlHashes;
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int count = 0;
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for (int i = 0; i < this.indexContainers.length; i++) {
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// delete entries separately
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int c = 0;
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urlHashes = new String[this.indexContainers[i].size()];
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urlIter = this.indexContainers[i].entries();
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while (urlIter.hasNext()) {
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indexEntry = (plasmaWordIndexEntry) urlIter.next();
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urlHashes[c++] = indexEntry.getUrlHash();
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}
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count += wordIndex.removeEntries(this.indexContainers[i].wordHash(), urlHashes, true);
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log.logFine("Deleted partial index (" + c + " URLs) for word " + this.indexContainers[i].wordHash() + "; " + this.wordIndex.indexSize(indexContainers[i].wordHash()) + " entries left");
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this.indexContainers[i] = null;
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}
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return count;
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}
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}
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